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1. Originally Posted by smj
I thought the test went well. Had plenty of time.

On the chebychev, i put 1/4.
I answered 1/8. I thought the upper bound was 1/4 total, so 1/8 in each tail, and the question was asking about the upper tail only.

2. Originally Posted by Hermann
BTW, I got 0.25 or 1/4 for the Chebyshev's inequality.
P([x-mu]>k(stdev)) < 1/k^2

x= 8000
mu = 5000
stdev = 1500
k=2 because (8000-5000)/1500 = 2 std deviations

P([x-5000]>1500*2) < 1/2^2

<1/4

But the Chebyshev problem asked for P[X>8000] with mean 5000 and standard deviation 1500. Don't you need to divide 1/4 by 2 because Chebyshev's inequality gives the probablity of the absolute value. And the problem told us that the distribution is symmetric around the mean. I think that I put 0.125.

3. At the time you were discussing the questions, not everyone had finished the test - in fact, there may have even been a case where people had not even begun the test (Hawaii, Alaska and other people just this side of the International Date Line). The generally accepted time of being able to discuss the test specifics is 5 PM Eastern Standard Time (East Coast of USA).

4. ## Feeback Please, on Exam P

If you have taken exam P before, how did this NEW version compare? Was it easier, or just about the same level of difficulty?

I wish I had some more time. I had 8 more problems at the end of the exam.

5. I didn't take any of the other exams but I thought this exam was easier than I expected it to be, although some questions I had trouble with. I was a little upset that there weren't more distribution types on the exam, not b/c I wanted them to be there but because I spent so much time memorizing them, stupid beta and pareto, what a waste of time, haha.

I flew through the first 10-15 questions in about an hour, but the last half I needed every minute of time they gave us (I think i filled in my last answer with just enough time to spare to put my pencil down.)

Hope you did well.

6. OK to discuss now.

7. ## Better than 11/04 for me

Well, I can definitely say that I did a lot better on this exam than I did back in 11/04. For 24 of the questions, the answer I calculated was one of the choices (doesn't mean I got it right, but it's a good sign I guess). I had to guess on six problems and 1 of those guesses I had the problem narrowed down to two choices. It was the binomial question where it had a the summation symbols in front of the probability function. I think I choose A on that one.

How well does everyone else think they did?

8. Originally Posted by Karen
But the Chebyshev problem asked for P[X>8000] with mean 5000 and standard deviation 1500. Don't you need to divide 1/4 by 2 because Chebyshev's inequality gives the probablity of the absolute value. And the problem told us that the distribution is symmetric around the mean. I think that I put 0.125.
I support Karen. I think she is right.

9. I agree

#1-10 were cake

But for some reason the teens got me

#20-30 were ok.

When I was studying i averaged 6 out of 10 correct. I believe I did the same for this test.

I am not sure how many we have to get right in order to pass. We will see.

10. ## I thought it was cake

Honestly, I've taken it twice before...and I dunno if it's because I prepared better this time around, but I thought it was pretty simple. Only had to guess on two problems, and they were educated guesses too - not random. I guess I'll find out in July really how "cake" it was